Equivalent & Substitute Parts for MF-R020-0-99

Part Overview

The MF-R020-0-99 is a polymeric PTC resettable fuse manufactured by Bourns Inc., rated for 60V maximum voltage and 200 mA hold current. This component is classified as obsolete, which necessitates identification of active equivalent and substitute parts for ongoing design and procurement requirements. The part functions as a thermal protection device in through-hole radial configuration, suitable for applications requiring automatic fault recovery without component replacement.

Substiute Parts

MF-R020-0-99

Bourns Inc.In Stock: 1030MF-R020-0-99 Datasheet

Current PartRFQ

MF-R020

Bourns Inc.In Stock: 10481MF-R020 Datasheet

Parametric EquivalentRFQ

MF-R020-0-17

Bourns Inc.In Stock: 3685MF-R020-0-17 Datasheet

Parametric EquivalentRFQ

MF-R020-0-D6

Bourns Inc.In Stock: 1226MF-R020-0-D6 Datasheet

Parametric EquivalentRFQ

MF-RX020/72-0

Bourns Inc.In Stock: 3662MF-RX020/72-0 Datasheet

Parametric EquivalentRFQ

MF-RX020/72-0-17

Bourns Inc.In Stock: 724MF-RX020/72-0-17 Datasheet

Parametric EquivalentRFQ

RXEF020

Littelfuse Inc.In Stock: 10155RXEF020 Datasheet

DirectRFQ

PFRA.020

SCHURTER Inc.In Stock: 870PFRA.020 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the MF-R020-0-99 is determined by the following critical parameters:

Primary Substitution Criteria:

• Voltage - Max: 60V (minimum requirement; higher voltage ratings are acceptable)
• Current - Hold (Ih) (Max): 200 mA (exact match required)
• Current - Trip (It): 400 mA (exact match required)
• Mounting Type: Through Hole
• Package / Case: Radial, Disc
• Physical dimensions and lead spacing compatibility

Substitution Categories:

Category 1: Direct Parametric Equivalents (60V Rating) Parts MF-R020, MF-R020-0-17, and MF-R020-0-D6 are parametric equivalents manufactured by Bourns Inc. with identical electrical specifications and physical dimensions to the main part. These parts differ only in packaging format or product status (active vs. obsolete).

Category 2: Higher Voltage Equivalents (72V Rating) Parts MF-RX020/72-0 and MF-RX020/72-0-17 are manufactured by Bourns Inc. with identical hold current, trip current, and physical dimensions. The 72V maximum voltage rating exceeds the 60V requirement, making these parts suitable for applications where the original 60V specification is not a limiting constraint.

Category 3: Cross-Manufacturer Equivalents Part RXEF020 (Littelfuse Inc., PolySwitch series) and PFRA.020 (SCHURTER Inc., PFRA series) provide equivalent functionality with matching hold current and trip current specifications. Minor variations exist in initial resistance and physical dimensions within acceptable tolerances for through-hole radial mounting.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: MF-R020-0-17

The MF-R020-0-17 is the preferred substitute for the obsolete MF-R020-0-99. This part is manufactured by Bourns Inc. within the same Multifuse MF-R series, maintains identical electrical and physical specifications, and carries active product status. The MF-R020-0-17 includes expanded approval agency certifications (cUL, cURus, TUV, UL) and AEC-Q200 automotive qualification rating, providing enhanced compliance documentation for regulated applications.

Secondary Recommendation: MF-R020

The MF-R020 is a parametric equivalent available in bulk packaging with the highest inventory availability (10,429 pcs). This part is suitable for applications where packaging format flexibility is acceptable and cost optimization is a priority.

Alternative Recommendation: MF-R020-0-D6

The MF-R020-0-D6 maintains identical specifications to the main part and is available in active status with 1,126 pcs inventory. This option is appropriate when specific packaging or distribution channel requirements align with this variant.

Higher Voltage Alternatives: MF-RX020/72-0 and MF-RX020/72-0-17

These 72V-rated parts are suitable substitutes when circuit design permits operation at the higher voltage rating. The MF-RX020/72-0-17 variant includes expanded certifications (cUL, cURus, TUV, UL) and AEC-Q200 qualification. These parts maintain identical hold current, trip current, and physical dimensions.

Cross-Manufacturer Options: RXEF020 and PFRA.020

RXEF020 (Littelfuse Inc., PolySwitch series) is available with 10,100 pcs inventory and 72V rating. Physical dimensions vary slightly (0.118" thickness vs. 0.122"), and initial resistance is 1.83 Ohms compared to 1.5 Ohms. Approval agencies include CQC, CSA, TUV, and UL.

PFRA.020 (SCHURTER Inc., PFRA series) maintains 60V rating with identical electrical specifications and physical dimensions. This part is available with 841 pcs inventory and carries cURus and TUV approvals.

Frequently Asked Questions (FAQ)

Q: Can MF-R020-0-17 be used as a direct replacement for MF-R020-0-99?

A: Yes. The MF-R020-0-17 is a direct parametric equivalent with identical voltage rating (60V), hold current (200 mA), trip current (400 mA), and physical dimensions. The primary difference is product status (active vs. obsolete) and expanded certifications on the MF-R020-0-17.

Q: What is the difference between the 60V and 72V rated parts?

A: The 72V-rated parts (MF-RX020/72-0, MF-RX020/72-0-17, RXEF020) have a higher maximum voltage specification. All other electrical parameters (hold current, trip current, time to trip) remain identical. The 72V parts are suitable for applications where the circuit voltage does not exceed 72V. If the original design specifies 60V maximum, the 60V-rated parts (MF-R020, MF-R020-0-17, MF-R020-0-D6, PFRA.020) are preferred.

Q: Are there physical dimension differences between substitute parts?

A: Most Bourns and SCHURTER parts maintain identical dimensions (0.291" Dia x 0.122" T). The Littelfuse RXEF020 has a slightly reduced thickness (0.118" vs. 0.122") and lead spacing variation (0.199" vs. 0.201"). These minor differences are within acceptable tolerances for through-hole radial mounting on standard PCB layouts.

Q: What certifications should I verify for my application?

A: The MF-R020-0-99 carries cURus and TUV approvals. The MF-R020-0-17 and MF-RX020/72-0-17 include expanded certifications (cUL, cURus, TUV, UL) and AEC-Q200 automotive qualification. Cross-manufacturer parts carry different approval agencies: RXEF020 includes CQC, CSA, TUV, and UL; PFRA.020 includes cURus and TUV. Verify that the selected substitute meets all regulatory requirements for your specific application.

Q: What is the difference in initial resistance between parts?

A: Most parts specify 1.5 Ohms minimum initial resistance. The Littelfuse RXEF020 specifies 1.83 Ohms minimum initial resistance. All parts maintain identical post-trip resistance maximum (4.4 Ohms). This variation is within acceptable operating parameters for PTC resettable fuse applications.

Q: Which substitute has the best inventory availability?

A: The MF-R020 (Bourns Inc.) has the highest inventory with 10,429 pcs available. The RXEF020 (Littelfuse Inc.) has 10,100 pcs. Both are suitable for high-volume procurement requirements.

Q: Can I use a cross-manufacturer part (Littelfuse or SCHURTER) instead of Bourns?

A: Yes, provided the electrical specifications and certifications meet your application requirements. RXEF020 and PFRA.020 are parametric equivalents with matching hold current and trip current. Verify that approval agencies and compliance certifications align with your design standards before implementation.